"No bill of attainder, ex post facto law, or law denying or impairing the right of property in negro slaves shall be passed."
That’s Article 1, Section 9, Clause 4 of the Confederate constitution.
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"No person held to service or labor in one state, under the laws thereof, escaping into another, shall, in consequence of any law or regulation therein, be discharged from such service or labor, but shall be delivered up on claim of the party to whom such service or labor may be due."
Article IV, section 2 of the United States Constitution.
Less explicit, but essentially says the same thing.
Or do you believe that someone can be just a little bit pregnant?
That doesn’t uphold the notion that the Civil War was not about the institution of slavery and the abolition thereof, or not “sparked” thereby. The confederate constitution making it “more explicit” (in a number of other clauses beside the one I cited) highlights this matter, as does the passage of the Thirteenth Amendment. The notion of a “fugitive slave clause” was absent from the Articles of Confederation to boot.